I’ve also seen a more academic critique where the author suggested that part of her saying that about Pemberley was that despite the fact that the grounds are massive and the house one of wealth, the grounds were not over-maintained…they weren’t made into follies or fake paths; they were maintained as a natural setting, and Pemberley wasn’t overly ostentatious for its wealth (Elizabeth comments on this in the book); meaning that Darcy has good sense about natural spaces and about wealth that she might not have appreciated at first, but when we saw Pemberley, it showed he did not try to basically be as bling-y as possible. (I think the mention by Elizabeth is at the beginning of book 3).